Mega joy II 2000??

rune_great · Post by **rune_great** » Sat Aug 19, 2006 4:50 am

I found an auction for a Mega Joy II and thought that it probably contained a NOAC. So I bought it thinking that I'd build a nes in an old Ps2 case I had laying in my closet.

I think it's Nes realted because of the games in it. But the chip doesn't look like the noacs I've seen around the internet.

(crappy cellphone image, sorry about that)

One side has a epoxy covered chip with 51 (I think) pins. The chip also has a number printed on it. "TN 040425". Looks kinda like a manufacturing date to me.
On the other side anoter small circuitboard is soldered onto the first one. It has also a epoxy covered chip and that circuit board has 44 pins. I think this must be the game chip. It had a sticker with some numbers on it "C745 16M" "050323".

The main board doesn't have any cartridge connector or solderpoints to connect one.
One strange thing is that the gamepad itself just says Yakima electronics and so does the instrcution sheet. But the translated instructions says "Mega joy II 2000"

I've searched the internet like crazy but I haven't been able too find anything.

I'd be very greatful if someone could help me with some information about this.

http://img219.imageshack.us/img219/491/dsc00119vi2.jpg
http://img219.imageshack.us/img219/2066/dsc00119ws2.jpg
http://img219.imageshack.us/img219/7826/dsc00125zu8.jpg
http://img219.imageshack.us/img219/5139/dsc00126dy5.jpg

scherzo · Post by **scherzo** » Sat Aug 19, 2006 5:48 am

Sounds like you might have a Genesis-on-a-chip. The chip with 16M on it is definitely the ROM chip containing the games. However, 44 pins also the number of pins found on the Radica's ROM chip as well. I'm certain you've got a GOAC.

EDIT: That's probably why it's called "Mega" Joy... as in Mega Drive.

rune_great · Post by **rune_great** » Sat Aug 19, 2006 6:55 am

I don't think most of those games were ever released on the Genesis.

The intro on this joypad is taken from duckhunt.

Here's the game list.

1. Jewel Tetris
2. Lunar ball
3. Chess
4. Mathematic
5. Math + -
6. Math
7. Mortal combat
8. Gradius
9. 1942
10. New human
11. Legend of Kage
12. Wrestle
13. Urban champion
14. Kung fu
15. Knights fight
16. Tank
17. Star force
18. Combat
19. Raid on bay
20. Macross
21. Sky destroyer
22. Spartan
23. Formation Z
24. Adventure island
25. Warpman
26. Burger time
27. Galaza (It's spelled that way)
28. Adventure land
29. Ninja
30. Clu clu land
31. Arabian
32. F1 race
33. Road fighter
34. Zippy race
35. Rugged car
36. Long jump
37. Power soccer
38. Hyper olympic
39. Hurdles
40. Javelin throw
41. Skeet shooting
42. Triple jump
43. Archery
44. High jump
45. 100m dash
46. Circus Chablie (a nice misspelling there too)
47. Dig dug
48. Mappy
49. Popeye
50. Lode runner
51. Ant adventure
52. Nuts and milk
53. Bomber man
54. Pacman
55. Pooyan
56. Rope exhibition
57. Battle city
58. Super digdug
59. Runner man

And on the bottom is a note. "The last five games are not availible"
Why put them on the list then??

scherzo · Post by **scherzo** » Sat Aug 19, 2006 7:45 pm

Yeah, lots of NES games there. Hmmm, weird. You need at least 60 pins for NES games, I thought. Maybe there are pins that most games don't use that they were able to eliminate.

bioniclebert · Post by **bioniclebert** » Sat Aug 19, 2006 7:55 pm

Thats a Plug in and play Standard system. It's almost NOAC, but it loads NES roms off of a 40-44 pin FLASH memory chip (or in this case, just plain ROM). However, If you got your own 44 pin flash memory chip, you could try to replace the one on there with yours.
The only thing is, the chip may be organized in a certian way, and you may not be able to just dump NES games on it and make it work.

My only suggestion is to find a pinout of that chip, and rewire those data lines to the pinout of any mapper 0 NES cart's ROM chip, and then try booting it up on a NES. If that works, you could then try dumping the cart on a computer to see how the ROM files are organized. Then you could buy a flash chip and load up games in it and replace it.

I have a TV plug in and play thing, and the only thing I've done so far is make a complete pinout of the ROM for it, I haven't added any NES roms to it yet. Mine already has a FLASH memory chip inside it, but I still need a programmer to interface it. Otherwise I could help you out.

If you aren't ready to do quite a bit of work, then you wont be able to do anything with it. Mine has been sitting here for a long time as there are quite a bit of snags I still have to work out.

rune_great · Post by **rune_great** » Sun Aug 20, 2006 2:25 am

I enough electronics to understand what you're saying. But I doubt I know enough to actually do it. But I'll give it a try. If I fail. Big deal. That thing only costed me like 10$ anyway.

Thanks for the help everyone. I'll get back here when I got a real noac.
Anyone who knows where I can find a cheap one. And I need it shipped to sweden.
That megajoy thingie was the only one I've been able to find so far.

Kenny_McCormic · Post by **Kenny_McCormic** » Tue Aug 22, 2006 9:45 am

hey u know what i just realised i know it probly isnt but maybe just maybey dont most snes games use a 40 pin rom chip are you thinkin what im thinkin somone needs to test this

bioniclebert · Post by **bioniclebert** » Tue Aug 22, 2006 9:59 am

Kenny_McCormic wrote:hey u know what i just realised i know it probly isnt but maybe just maybey dont most snes games use a 40 pin rom chip are you thinkin what im thinkin somone needs to test this

Well It's not really about the pins, but the data lines. The NES uses A0-A18, and D0-D7, IIRC.

http://nintendoallstars.w.interia.pl/romlab/memory.htm

Those are all the ROM pinouts for various systems. Even tough it's called the ROMLAB, It dosen't have any downloadable roms. The site is based around hardware modding.

Anywho, you'd need to find a compatable chip to the ones used in NES games, and wire it up that way. I have a 40 pin TSOP flash chip, and a AT29C040A waiting to be flashed and put in carts. The AT29C040A just happens to be listed on that page, and It has almost the EXACT same pinout as some SNES carts. (all inputs/outputs the same, just in a different order).

So basically, even though it might have the pins for a SNES, it might not have the same pinout as a SNES ROM chip. Plus it most likely has NES roms on it anyway, due to all the NES-like games on there.
bioniclebert